40001771 has 2 divisors, whose sum is σ = 40001772. Its totient is φ = 40001770.

The previous prime is 40001743. The next prime is 40001777. The reversal of 40001771 is 17710004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40001771 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40001777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000885 + 20000886.

It is an arithmetic number, because the mean of its divisors is an integer number (20000886).

Almost surely, 2^40001771 is an apocalyptic number.

40001771 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001771 is an equidigital number, since it uses as much as digits as its factorization.

40001771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 40001771 is about 6324.6953286305. The cubic root of 40001771 is about 342.0002365399. Note that the first 3 decimals are identical.

Adding to 40001771 its reverse (17710004), we get a palindrome (57711775).

The spelling of 40001771 in words is "forty million, one thousand, seven hundred seventy-one".